PSYA01H3 Chapter 5: Chapter 5 Notes - Part Four
Document Summary
Accommodation: changes in the thickness of the lens of the eye that focus images of near or distant objects on the retina. Normally, the length of the eye matches the bending of light rays produced by the cornea and the lens so that the image of the visual scene is sharply focused on the retina. For some people, these two factors are not matched. People whose eyes are too long (front to back) are nearsighted [need concave lens to correct the focus] People whose eyes are too short are farsighted [need convex lens] Retina: lines the inner surface of the back of the eye and performs the sensory functions of the eye. Photoreceptors: (over 130 million embedded in the retina) Specialized neurons that transducer light into neural activity. Info from photoreceptors is transmitted to neurons that send axons toward one point at the back of the eye: the optic disc.
